Which of the statement is not correct with reference to conditional clause?
1
The structure of a zero conditional sentence is if/when + Subject + present simple, Subject + Present/Base form of Verb.
2
The structure of a 1st conditional sentence is if/when + Subject + present simple, Subject + will + Base form of Verb.
3
The structure of a 2nd conditional sentence is if/when + Subject + past simple, Subject + would/wouldn't + verb.
4
The structure of a 3rd conditional sentence is If + Subject + past perfect, Subject + would/wouldn't + verb.